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Reinforced scrim and its manufacturing method and process

Reinforced scrim and its manufacturing method and process

  • Categories:Industry News
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  • Time of issue:2022-01-21 14:03
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(Summary description)The reinforced scrim consists of MD scrims arranged in multiple layers, each of which consists of individual fibers arranged side by side in one layer, at least two layers being angled with respect to each other in the layer plane and connected by means of a fixing agent.

Reinforced scrim and its manufacturing method and process

(Summary description)The reinforced scrim consists of MD scrims arranged in multiple layers, each of which consists of individual fibers arranged side by side in one layer, at least two layers being angled with respect to each other in the layer plane and connected by means of a fixing agent.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2022-01-21 14:03
  • Views:0
Information

The reinforced scrim consists of MD scrims arranged in multiple layers, each of which consists of individual fibers arranged side by side in one layer, at least two layers being angled with respect to each other in the layer plane and connected by means of a fixing agent.

reinforced scrim

Due to the fact that in some cases a pre-specified material thickness must be adhered to, it is necessary to provide multiple reinforced scrims overlapping. For this purpose, it is currently known to produce multiaxial scrims in such a way that two individual scrims consisting of fibers arranged individually side by side in one layer are laid or wound at an angle of, for example, 45° together. In addition to this, there is also the possibility of providing a 0° layer in addition to the two ±45° layers in the longitudinal direction of the multiaxial scrim. For this purpose, it is known to interconnect the individual multiaxial scrims laid together by means of sewing or gluing techniques. If the reinforced scrims are stitched to each other, special machines are required, which are time-consuming for stitching. It has been shown here as a further disadvantage that, especially for later use, gaps between the scrims to be stitched due to the manufacturing process can lead to instability of the stitched surfaces. This disadvantage does not occur if the individual fibers are arranged next to one another without play and are connected to one another by adhesive threads or webs of adhesive threads, whereby the fibers can no longer move in the once-fixed position. In this way, however, a dense web is usually formed, which is difficult to penetrate by the added resin. On the other hand, it has also been confirmed that the penetration of the resin can be improved due to the formation of voids between the individual fibers due to the puncture channel that occurs during stitching. Of course, depending on the future application, a combination of the two methods may be justified in order to achieve the required strength values ​​on the one hand, but at the same time to ensure that the resin used is able to penetrate all reinforced scrim layers. In addition to this, other variants can also be used depending on the purpose of use.

The production of the reinforced scrim can be carried out by means of a cross/lay-up technique, but also by a winding technique, in which at least two oppositely extending fiber bundles are wound around each other at a winding angle of eg ±45°. This creates the possibility of providing the individual scrims with cohesive threads or webs, so that further fibers placed on the first scrim are connected to the first scrim.

Reinforced scrims typically consist of two single layers or, if necessary, three layers and are referred to as MD scrims. Since the existing thicknesses of MD scrims require several individual working steps, which on the one hand have to be carried out carefully and on the other hand are very time-consuming, in order to achieve the desired layer thicknesses and advantages.
 

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